What do the characters I've found on this old gun mean?

Question

On an antique shotgun I was told had Korean origin I found the following (what I presume are Hanja?) characters. Four out of five I believe I have correctly identified. One character I could not find in the dictionary.

However, my only resources are Chinese and I know almost nothing about Chinese characters' usage in Korea^†.

Side A:

[UNKNOWN CHARACTER] 製 特

Side B:

絞 筒

The unknown character is three stacked components in this basic form

-------
   人  
-------
   𠂇  
-------
   巾  
-------

Though, the bottom component might well be 中, there is quite a bit of tarnish obscuring it.

On Side A, the two characters that follow the unknown one seem to indicate "special manufacture".

One Side B, I get the translation "hang" or "twist" for character one, and "tube" for character two. To me, this might indicate the process of rifling, but I could not find any use of these characters on the Chinese character entry for rifling, and the barrel is old and I couldn't tell conclusively if it'd ever undergone that process.

Can someone help me translate these characters?^*

<sup>† I'm also not certain the Korean origin of this piece, but that is what I was told.
* Please let me know if this might be a better fit for the Chinese language stack. I ask here with the idea that Korean usage of these characters might be idiomatic and more suitable for this sub. Thanks.</sup>

Edit

I was able to take some acceptable close up imagery:

Answer 1

In the second photo,「絞筒」refers to the barrel of the gun.

In the first photo, the unknown character looks like「⿱人布」. I suggest that this is a slightly altered way of writing 「⿱𠂉布」, since the shape「人」is sometimes altered to「𠂉」at the top of characters:

At least in Chinese records, this is a variant of either「布」or「希」.

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1. If it's「布」, it would be a phonetic transcription character「포」, and is a proper noun marking the person, organisation, or location which manufactured (製) the gun.

2. If it's「希」, it may also be a proper noun, but alternatively you may choose to interpret this as「드물다・稀」(rare, scarce).「希特製」means something like rare and uniquely made or special edition; its semantic connection to antique would be obvious in this case.

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Just from the photos, there's nothing unique that suggests that this is Korean; as an antique, it could be Chinese, Japanese, Korean, or Vietnamese.

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References:

• 教育部異體字典